add function to mirror system config in home config

modules/global/helpers.nix

@@ -1,11 +1,37 @@
 { inputs, self, ... }: {
   flake.nixosModules.global = { pkgs, config, lib, ... }: {
     options.helpers = {
-      # nothing here yet
+      typeOf = lib.mkOption {
+        type = lib.types.functionTo lib.types.str;
+        default = value: (
+          if builtins.isAttrs value then "attrs" else (
+            if builtins.isBool value then "bool" else (
+              if builtins.isFloat value then "float" else (
+                if builtins.isFunction value then "function" else (
+                  if builtins.isInt value then "int" else (
+                    if builtins.isList value then "list" else (
+                      if builtins.isPath value then "path" else (
+                        if builtins.isString value then "str" else ""
+                      )
+                    )
+                  )
+                )
+              )
+            )
+          )
+        );
+        readOnly = true;
+      };
+
+      attrByStrPath = lib.mkOption {
+        default = strPath: set:
+          lib.attrsets.attrByPath (lib.strings.splitString "." strPath) null set;
+        readOnly = true;
+      };
     };
   };
 
-  flake.homeModules.global = { pkgs, config, lib, ... }: {
+  flake.homeModules.global = { pkgs, config, osConfig, lib, ... }: {
     options.helpers = {
       mkSymlinkActivationScript = lib.mkOption {
         type = lib.types.functionTo lib.types.str;
@@ -15,6 +41,19 @@
           fi
           ln -s ${config.info.rootPath}/${source} /home/grey/${target}
         '';
+        readOnly = true;
+      };
+
+      inheritOsConfigToHome = lib.mkOption {
+        type = lib.types.functionTo lib.types.attrs;
+        default = let
+          safeOsConfig = builtins.tryEval osConfig;
+        in option: {
+          type = if safeOsConfig.success then safeOsConfig.value.helpers.attrByStrPath (safeOsConfig.value.helpers.typeOf (safeOsConfig.value.helpers.attrByStrPath option safeOsConfig.value)) lib.types else null;
+          default = (lib.mkIf (safeOsConfig.success) (safeOsConfig.value.helpers.attrByStrPath option safeOsConfig.value)).content;
+          readOnly = true;
+        };
+        readOnly = true;
       };
     };
   };